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"I don't know either" vs "I don't know neither"

If someone else doesn't know something, and you also don't know it, then you might say, "I don't know either."

Last Updated: March 20, 2019

I don't know either

This is correct

A friend doesn't know the answer to a question. You also don't know the answer.

When the friend asks you if you know the answer, you might reply, "I don't know either."

"Either" is optional in this sentence. "I don't know" would convey the same meaning.

ExpertExplanation provided by a TextRanch English expert


Some examples from our editors:

  • A: I don't know that man's name. Do you know it?
  • B: I don't know either.
  • A: I don't know if this sentence is correct. Do you?
  • B: I don't know either. We should have the TextRanch editors check it.

Some alternatives from our editors:

  • I don't know.

I don't know neither

This is not correct. Don't use this phrase.

In English, double negatives are avoided. "Don't" and "neither" both have negative connotations.

To avoid this problem, change "neither" to "either."

ExpertExplanation provided by a TextRanch English expert


Some alternatives from our editors:

  • I don't know either.

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